#include <stdio.h>
#include <pthread.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>

void *thread_summation(void *arg);
int sum = 0;
int main(int argc, char *argv[])
{
    pthread_t id_t1, id_t2;
    int range1[]={1, 5};
    int range2[]={6, 10};

    pthread_create(&id_t1, NULL, thread_summation, (void *)&range1);
    pthread_create(&id_t2, NULL, thread_summation, (void *)&range2);
   

   pthread_join(id_t1, NULL);
   pthread_join(id_t2, NULL);
  
    printf("Thread return sum: %d \n", sum);
    return 0;
}

void * thread_summation(void *arg)
{
    int start = ((int *)arg)[0];
    int end = ((int *)arg)[1];
    char *msg = (char *)malloc(sizeof(char)*50);

    while (start<=end)
    {
        sum += start;
        start++;
    }
    return  NULL;
}